Yea Ive used the Source SDK, I'm pretty much a mapping junkie, that and the faceposer's always fun to mess with, The SDK was actually a big part in why I bought it for the $10 since it has new textures and models and the likes it'll make for a nice change in pace.

That and I had been looking at sin eps since before it was released then kinda questioning whether or not too get it after reading what some thought about it, and seeing the reveiw on G4's Xplay (2/5), but I think it'll be worth it...